Davis Cup: US wins doubles to stay alive in quarterfinal

John Peers and Sam Groth are due to take on Sam Querrey and Steve Johnson, but Australian skipper Lleyton Hewitt suspects the Americans might change things up, possibly by injecting Sock into the mix.

It may not win over all of his critics but it's certainly helping him win matches, including one over American John Isner as Australia went up 2-0 on a dream opening day of their Davis Cup quarterfinal tie in Brisbane.

After trading the first two sets, Thompson went up 4-1 early in the third.

Instead of prolonging the agony for the vastly overmatched Swiss team on doubles day, Courier pulled Querrey and inserted the most successful doubles player on the US squad, No. 1 singles player Jack Sock.

American captain Jim Courier had said publicly all week that he respected the tenacity and fitness of Thompson, especially in a competition with the Davis Cup's capacity for upsets.

On Sunday, Kyrgios is up first and scheduled to play Sock, and then Thompson is set to take on Isner.

Thompson carried all the momentum with him into the fourth set against an increasingly exhausted looking Sock and closed out the match in three hours.

However, their momentum was snapped when the United States broke to love off Peers' serve, and then snuffed out any chance of an Australian comeback to keep the tie alive.

The winners of the tie will face either Serbia or Spain in the semi-finals.

The clash between world number 16 Kyrgios and the 23rd ranked Isner will follow Jack Sock's first meeting with 22-year-old Australian Jordan Thompson on the hardcourt of the Pat Rafter Arena.

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"He played a good match - he deserved to win", a disappointed Sock said.

"That was unbelievable today", 21-year-old Kyrgios said of the crowd support.

It was a mature display from Kyrgios, who won through superior court coverage and generally stronger shots.

"And whatever we think collectively is going to help us have the best chances is what everyone signed up for".

Following the win, Kyrgios said: "That was a lot of fun".

Australia's Sam Groth and John Peers are not low-ranked journeymen, as was the Swiss team Adrien Bossel and Henri Laaksonen.

"I'm pretty happy with the guy I've got on the other side of the net".

Australia will be out for revenge in this Davis Cup matchup, after being knocked out of the tournament by the Unites States a year ago.

It will be the 47th installment of the most-played tie in Davis Cup history between the great rivals, with the Americans leading 26-20.

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